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feat(host/linux): PUNKTFUNK_GAMESCOPE_STEAM opt-in for bare gamescope spawns

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Adds --steam (before the -- terminator, where PUNKTFUNK_GAMESCOPE_APP
cannot reach) to the bare headless gamescope spawn when the env var is
truthy, enabling gamescope's Steam integration for steam -gamepadui
dedicated sessions. Default off; managed gamescope-session-plus/SteamOS
sessions own their own flags and are unaffected.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-15 20:48:05 +02:00
parent 01266ff18d
commit 252960291e
2 changed files with 49 additions and 27 deletions
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crates/punktfunk-host/src/vdisplay/linux/gamescope.rs
+39 -27
View File
@@ -1359,6 +1359,21 @@ fn shape_dedicated_command(app: &str) -> String {
app.to_string()
}
/// Add the compositor-side arguments shared by every bare gamescope spawn. `steam_mode` belongs
/// before the `--` terminator; [`PUNKTFUNK_GAMESCOPE_APP`](spawn) configures the nested command
/// after it and therefore cannot enable gamescope's Steam integration itself.
fn add_bare_gamescope_args(command: &mut Command, w: u32, h: u32, hz: u32, steam_mode: bool) {
command
.args(["--backend", "headless"])
.args(["-W", &w.to_string()])
.args(["-H", &h.to_string()])
.args(["-r", &hz.to_string()]);
if steam_mode {
command.arg("--steam");
}
command.args(["--xwayland-count", "1", "--"]);
}
/// Spawn `gamescope --backend headless -W w -H h -r hz -- <app>`. The app comes from
/// `PUNKTFUNK_GAMESCOPE_APP` (default a no-op that just keeps gamescope alive — set it to a real
/// game/GL app for actual content, e.g. `steam -gamepadui` for the SteamOS-like session).
@@ -1385,33 +1400,30 @@ fn spawn(w: u32, h: u32, hz: u32, cmd: Option<&str>, log: &std::path::Path) -> R
let app = shape_dedicated_command(&app);
let relay = ei_socket_file();
let _ = std::fs::remove_file(&relay); // stale socket path from a previous session
let steam_mode = crate::config::config().gamescope_steam;
let mut cmd = Command::new("gamescope");
cmd.args(["--backend", "headless"])
.args(["-W", &w.to_string()])
.args(["-H", &h.to_string()])
.args(["-r", &hz.to_string()])
.args(["--xwayland-count", "1", "--"])
.args([
"sh",
"-c",
&format!(
"printf %s \"$LIBEI_SOCKET\" > '{}'; exec \"$@\"",
relay.display()
),
"sh",
])
.args(app.split_whitespace())
// Prefer the NVIDIA GL vendor for the nested session (harmless on a pure-NVIDIA box).
.env("__GLX_VENDOR_LIBRARY_NAME", "nvidia")
// A HEADLESS gamescope must never attach to a parent compositor. A host (re)started after
// a desktop login inherits the user manager's DISPLAY/WAYLAND_DISPLAY — and a stale
// WAYLAND_DISPLAY (e.g. a leftover `wayland-kde` in the manager env from a past session)
// makes gamescope 3.16 exit at startup with "Failed to connect to wayland socket" before
// its PipeWire node ever appears (observed 2026-07-14; the boot-started host never saw the
// bug because it predates any login's env import). gamescope exports its own DISPLAY /
// GAMESCOPE_WAYLAND_DISPLAY to the nested app, so the child loses nothing.
.env_remove("DISPLAY")
.env_remove("WAYLAND_DISPLAY");
add_bare_gamescope_args(&mut cmd, w, h, hz, steam_mode);
cmd.args([
"sh",
"-c",
&format!(
"printf %s \"$LIBEI_SOCKET\" > '{}'; exec \"$@\"",
relay.display()
),
"sh",
])
.args(app.split_whitespace())
// Prefer the NVIDIA GL vendor for the nested session (harmless on a pure-NVIDIA box).
.env("__GLX_VENDOR_LIBRARY_NAME", "nvidia")
// A HEADLESS gamescope must never attach to a parent compositor. A host (re)started after
// a desktop login inherits the user manager's DISPLAY/WAYLAND_DISPLAY — and a stale
// WAYLAND_DISPLAY (e.g. a leftover `wayland-kde` in the manager env from a past session)
// makes gamescope 3.16 exit at startup with "Failed to connect to wayland socket" before
// its PipeWire node ever appears (observed 2026-07-14; the boot-started host never saw the
// bug because it predates any login's env import). gamescope exports its own DISPLAY /
// GAMESCOPE_WAYLAND_DISPLAY to the nested app, so the child loses nothing.
.env_remove("DISPLAY")
.env_remove("WAYLAND_DISPLAY");
if let Ok(logf) = std::fs::File::create(log) {
if let Ok(log2) = logf.try_clone() {
cmd.stdout(Stdio::from(logf)).stderr(Stdio::from(log2));
@@ -1419,7 +1431,7 @@ fn spawn(w: u32, h: u32, hz: u32, cmd: Option<&str>, log: &std::path::Path) -> R
} else {
cmd.stdout(Stdio::null()).stderr(Stdio::null());
}
tracing::info!(w, h, hz, %app, log = %log.display(), "spawning gamescope (headless)");
tracing::info!(w, h, hz, steam_mode, %app, log = %log.display(), "spawning gamescope (headless)");
cmd.spawn()
.context("spawn gamescope (is it installed? `apt install gamescope`)")
}